Methods and compositions for compensating for cement hydration volume reduction
First Claim
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1. A cementing composition comprising:
- cement and a liquid composition comprising an active gas generating additive selected from the group consisting of aluminum powder and azodicarbonamide, wherein the active gas generating additive is coated or encapsulated with a surfactant and the surfactant is a fatty acid ester of sorbitan, glycerol or pentaerythritol.
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Abstract
A method and cementing composition that includes gas generating additives for compensating for or offsetting hydration volume shrinkage of the cementing compositions. The method comprises placing the cementing composition in a subterranean zone and allowing the cement composition to set into a solid mass therein.
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31 Claims
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1. A cementing composition comprising:
cement and a liquid composition comprising an active gas generating additive selected from the group consisting of aluminum powder and azodicarbonamide, wherein the active gas generating additive is coated or encapsulated with a surfactant and the surfactant is a fatty acid ester of sorbitan, glycerol or pentaerythritol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A cementing composition comprising:
cement and a liquid composition comprising from about 0.3 to about 5.0 percent of an active gas generating additive by weight of the cement wherein the active gas generating additive is selected from the group consisting of aluminum powder and azodicarbonamide. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A cementing composition comprising:
cement and a liquid composition comprising greater than about 2.0 percent of an active gas generating additive by weight of the cement wherein the active gas generating additive is selected from the group consisting of aluminum powder and azodicarbonamide. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
Specification